ELATERIDAE. 



117 



elongate, feebly serrate antennae (Text-fig. 4, B). The individual antennal joints 

 are relatively long, their width being plainly less than half their length in even 



a 



Text-fig. 4. — Propsephus gracilicornis, sp. n. ; A, ventral view of hind coxal plate ; B, antenna 

 of female. 



the most robust (joints three to five). The antennae suggest an Adiaphorus, 

 but the suddenly widened coxal lamina, and the curved mucro distinguish the 

 species from that genus. 



Key to Samoan Species of Propsephus. 



1. Antennae conspicuously slender or elongate 

 1a. Antennae normal and of moderate length 



2. Antennal joints very wide ; prothorax strongly transverse 

 2a. Antennal joints very slender ; scutellum carinate 



3. Prothorax broadly arcuate on sides 

 3a. Prothorax not broadly arcuate on sides . 



4. Large insects, at least 15 mm. ; colour blackish 

 4a. Smaller insects ; brown to rufous .... 



5. Small insects, 9-11 mm. ..... 



5a. Larger insects, not less than 11 or over 13 mm. 



upoluensis, sp. n. 

 gracilicornis, sp. n. 



euaensis Schw. 

 4 



major 



Cand. 



tongaensis Cand. 

 rufipes Schw. 



The separation of P. tongaensis and P. rufipes upon size alone is admittedly 

 unsatisfactory, since long series tend to intergrade in this respect. However, 

 what I consider to be P. rufipes are all males, and are larger than even 

 the females of P. tongaensis. The possible identity of P. rufipes Schw. with 

 P. tongaensis Cand. can only be decided by reference to the types, which 1 

 have been unable to examine. 



